Let print_bpfmap_id be non-zero

By adding 1 to bpf_get_smp_processor_id(), we can safely rely on
"if event.PrintBpfmapId > 0" to decide whether there is bpfmap data to
read.

Signed-off-by: gray <[email protected]>

Author: jschwinger233

bpf/kprobe_pwru.c

@@ -367,7 +367,7 @@ static __always_inline u64
 sync_fetch_and_add(void *id_map) {
 	u32 *id = bpf_map_lookup_elem(id_map, &ZERO);
 	if (id)
-		return ((*id)++) | ((u64)bpf_get_smp_processor_id() << 32);
+		return ((*id)++) | ((u64)(bpf_get_smp_processor_id() + 1) << 32);
 	return 0;
 }
 

internal/pwru/output.go

@@ -458,7 +458,7 @@ func (o *output) Print(event *Event) {
 		fmt.Fprintf(o.writer, "%s", getShinfoData(event, o))
 	}
 
-	if o.flags.OutputBpfmap {
+	if o.flags.OutputBpfmap && event.PrintBpfmapId > 0 {
 		fmt.Fprintf(o.writer, "%s", getBpfMapData(event, o))
 	}